A smooth variation of Baas-Sullivan Theory and Positive Scalar Curvature

Details A smooth variation of Baas-Sullivan Theory and Positive Scalar Curvature A smooth variation of Baas-Sullivan Theory and Positive Scalar Curvature

2012-03-20

arxiv.org/abs/1203.4370v1

Mathematics

Geometric Topology

20 pages, 5 figures

Scientific paper

Let $M$ be a smooth closed spin (resp. oriented and totally non-spin) manifold of dimension $n\geq 5$ with fundamental group $\pi$. It is stated, e.g. in [RS95], that $M$ admits a metric of positive scalar curvature (pscm) if its orientation class in $ko_n(B\pi)$ (resp. $H_n(B\pi;\Z)$) lies in the subgroup consisting of elements which contain pscm representatives. This is 2-locally verified loc. cit. and in [Sto94]. After inverting 2 it was announced that a proof would be carried out in [Jun], but this work has never appeared in print. The purpose of our paper is to present a self-contained proof of the statement with 2 inverted.

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